Sir Khulu,
The B&C stock for the Ruger M77 Mk II/Hawkeye is a relatively new thing.
They make it with a big barrel channel that easily accepted a #5 Shilen Sporter.
You won't have to do much sanding to fit a fat .458 barrel.
They call it a "free-float magnum" barrel channel, 2.0 lbs stock weight, 13.625" LOP with 1" Decelerator.

https://www.bellandcarlson.com/index.cfm?fuseaction=category.display&category_ID=1157

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I had to sand the B&C Win M70 Short/WSM stock quite a bit to get a #4 Pac-Nor Sporter to fit,
2.25 lbs approx. stock weight, 13.625" LOP with 1" Decelerator.

The B&C Win M70 Long Action had a little bigger barrel channel, about a drop-in for #4 McGowen Sporter,
2.0 lbs stock weight, 13.75" LOP with 1" Decelerator.

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The B&C CZ 550 Magnum stock is a drop-in fit for the factory contour, same on all, .375, .416, .458.
2.5 lbs stock weight, 14.125" LOP, aluminum endoskeleton runs from rear of grip through forend tip sling stud attachment.
I sanded one of these out to fit a McGowen barrel made to Pac-Nor #6 Sporter contour with shortened breech cylinder/knoxform:

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Grip circumference on the CZ 550 Magnum palm swell is just a smidge bigger than that on the Ruger M77 and Winchester M70 models.
I like that Ruger M77 MkII/Hawkeye stock just fine.

Ron aka "Rip" for Riflecrank Internationale Permanente
NRA Life Benefactor and Beneficiary
.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.